.mall {
    width: 100%;
    height: 100%;
    /* background-color: #f5f5f5 */
}
.form-box {
    width: 100%;
    display: flex;
    justify-content: space-between;
    /* border: 2px solid red; */
}
.son-right{
    display: flex;
    /* border: 2px solid red; */
}